The throttle in your photo is not the original throttle so unfortunately, it is not compatible with the bike.
For that version of the Razor MX350 dirt bike, a 4-wire throttle with two orange and two brown wires is needed. This throttle is our item # THR-51 which is available on our Razor MX350 Parts Page. The THR-51 throttle has a cable and connector that will plug directly into the bike's controller so no wire splicing or wire connections will be needed.
I found a very beat up very small Razor dirt bike I'm wondering where the throttle wires connect to there's a red and the black one.
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